From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 2FAA63858410; Fri,  1 Oct 2021 22:04:19 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2FAA63858410
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/102546] [12 Regregression] Missed Dead Code
 Elimination regression (trunk vs 11.2.0) at -O3
Date: Fri, 01 Oct 2021 22:04:18 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: aldyh at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 12.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-102546-4-v5MbMXW1jv@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-102546-4@http.gcc.gnu.org/bugzilla/>
References: <bug-102546-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Fri, 01 Oct 2021 22:04:19 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102546

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Aldy Hernandez <aldyh@gcc.gnu.org>:

https://gcc.gnu.org/g:5f9ccf17de7f7581412c6bffd4a37beca9a79836

commit r12-4088-g5f9ccf17de7f7581412c6bffd4a37beca9a79836
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Fri Oct 1 13:05:36 2021 +0200

    [PR102546] X << Y being non-zero implies X is also non-zero.

    This patch teaches this to range-ops.

    Tested on x86-64 Linux.

    gcc/ChangeLog:

            PR tree-optimization/102546
            * range-op.cc (operator_lshift::op1_range): Teach range-ops that
            X << Y is non-zero implies X is also non-zero.=